I have an existing application which does all of its logging against log4j. We use a number of other libraries that either also use log4j, or log against Commons Logging, wh
Since version 2.1 of log4j exists the component log4j-jul, which allows exactly this. Still, in case you are using log4j 1, it has to be possible to upgrade to log4j2 in order to use this approach.